Answer:
Integumentary is least connected to the Digestive system
Watershed is the place where water of rain and snow get stored. The watershed contains surface water-and wetlands--and all the underlying ground water,lakes, streams, reservoirs. Lake is the major component of the watershed . The watershed can be used for various purpose like dams, hydrological modification etc.
1. DNA replication
2.Mitochondria transform chemical energy into electromagnetic energy.
3. It is constructed by connecting smaller monomer subunits.